Abstract
The ruthenium(II) polypyridyl complexes [Ru(dmb)2(TCPI)](PF6)2 (1) and [Ru(ttbpy)2(TCPI)](PF6)2 (2) (dmb = 4,4′-dimethyl-2,2′-bipyridine, TCPI = 2-(3-(1H-1,3,7,8-tetraazacyclopenta[l]phenanthren-2-yl)phenyl)benzo[de]isoquinoline-1,3-dione, ttbpy = 4,4′-ditertiary butyl-2,2′-bipyridine) were synthesized and characterized. The in vitro cytotoxicities of the complexes were examined against a panel of cancer cell lines including SGC-7901, PC-12, HepG-2, SiHa, Eca-109, HeLa, Eca-9706, HOS and LO2 by 3-(4,5-dimethylthiazole)-2,5-diphenyltetrazolium bromide (MTT) method. Both complexes show higher activities against PC-12 cells, with IC50 values of 34.4 ± 1.3 and 26.8 ± 2.4 μM for 1 and 2, respectively. Cell apoptosis was assayed with acridine orange (AO) and ethidium bromide (EB) and annexin V/PI staining methods using fluorescence microscopy and flow cytometry. The reactive oxygen species, mitochondrial membrane potential and cell cycle distribution were assessed. Cell invasion was determined by Matrigel invasion assay, and the proteins associated with cell apoptosis were analyzed by western blot. The results suggest that the complexes induce the apoptosis of PC-12 cells through a ROS-mediated mitochondrial dysfunction pathway, accompanied by regulation of the expression of caspases and Bcl-2 family proteins.
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Acknowledgments
This work was supported by the Natural Science Foundation of Guangdong Province (No. 2016A030313728), the High-Level Personnel Project of Guangdong Province in 2013 and the Joint Nature Science Fund of the Department of Science and Technology and the First Affiliated Hospital of Guangdong Pharmaceutical University (No. GYFYLH201315) and Project of innovation for enhancing Guangdong Pharmaceutical University, provincial experimental teaching demonstration center of chemistry & chemical engineering.
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Zeng, CC., Zhang, C., Lai, SH. et al. Synthesis, characterization and in vitro biological activities of ruthenium(II) polypyridyl complexes. Transit Met Chem 41, 923–931 (2016). https://doi.org/10.1007/s11243-016-0096-6
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DOI: https://doi.org/10.1007/s11243-016-0096-6